Definition from Wiktionary, the free dictionary
- (UK) As much as could be bought for a halfpenny (pre- or post-decimalisation).
- (UK, informal) A negligible amount.
- he's never been a ha'p'orth of bother
- Also used in combination with larger amounts, as in "twopence halfpennyworth" (as much as could be bought for two and a half pence).
- New Oxford American Dictionary